Author: Robert Hyatt
Date: 06:58:44 07/07/02
Go up one level in this thread
On July 07, 2002 at 07:42:30, Robert Henry Durrett wrote: >On July 07, 2002 at 02:57:20, Slater Wold wrote: > >>I guess this could be asked of any chess engine, but in this particular case I >>am using Crafty 18.15. >> >> >>I was messing with nullmove in Crafty. Just trying to "trigger" different >>responses. (Testing certain theories inside of Crafty to perhaps adapt some of >>this into my own "work in progress".) >> >> >>This struck me as odd: >> >>If I change null_min to 0 and null_max to 2, I get a complete new engine. >> >>Example: >> >>null_min = 3 >>null_max = 4 >> >>White(1): setboard r1bqk2r/pp1p1ppp/2nb1n2/2p1p3/Q1P5/2N2NP1/PP1PPPBP/R1B1K2R b >>Black(1): go >> clearing hash tables >> time surplus 0.00 time limit 1:00 (1:00) >> nss depth time score variation (1) >>starting thread 1 >> 6 0.12 0.50 1. ... Qa5 2. Qxa5 Nxa5 3. Nb5 Bb8 >> 4. d3 d5 >> (2) 6-> 0.14 0.50 1. ... Qa5 2. Qxa5 Nxa5 3. Nb5 Bb8 >> 4. d3 d5 >> 7 0.17 0.74 1. ... Qa5 2. Qxa5 Nxa5 3. d3 a6 4. >> Kd1 Ng4 5. Rf1 >> 7 0.28 0.40 1. ... Qe7 2. Nb5 Ng4 3. h3 Nf6 4. >> d3 Kf8 5. Nxd6 Qxd6 >> 7-> 0.40 0.40 1. ... Qe7 2. Nb5 Ng4 3. h3 Nf6 4. >> d3 Kf8 5. Nxd6 Qxd6 >> 8 0.65 0.54 1. ... Qe7 2. Nb5 Kf8 3. Kd1 Ng4 4. >> Rf1 e4 5. Nxd6 Qxd6 >> 8-> 0.98 0.54 1. ... Qe7 2. Nb5 Kf8 3. Kd1 Ng4 4. >> Rf1 e4 5. Nxd6 Qxd6 >> 9 3.01 0.66 1. ... Qe7 2. Nh4 Nd4 3. Nb5 Nxb5 4. >> Qxb5 Ng4 5. Bxb7 Rb8 6. Nf5 Rxb7 7. >> Nxe7 Rxb5 8. Nxc8 >> 9 7.07 0.64 1. ... Qb6 2. Kd1 h6 3. d3 Kd8 4. Nb5 >> Be7 5. Ke1 Ke8 >> 9 7.09 0.61 1. ... Be7 2. d3 d6 3. Nd5 Nxd5 4. >> cxd5 Qa5+ 5. Qxa5 Nxa5 6. Bd2 b6 7. >> Kd1 >> 9 8.98 0.53 1. ... Qa5 2. Qxa5 Nxa5 3. Nb5 Bb8 >> 4. d3 e4 5. dxe4 Nxc4 6. Ng5 >> (4) 9-> 9.21 0.53 1. ... Qa5 2. Qxa5 Nxa5 3. Nb5 Bb8 >> 4. d3 e4 5. dxe4 Nxc4 6. Ng5 >> (3) 10 9.92 0.82 1. ... Qa5 2. Qxa5 Nxa5 3. d3 Nc6 4. >> Nb5 Bb8 <HT> >> (2) 10 12.79 0.70 1. ... Qb6 2. Kd1 Qb4 3. Qxb4 cxb4 >> 4. Nb5 Bb8 5. d4 Ng4 6. Rf1 Nxd4 7. >> Nbxd4 exd4 8. Nxd4 Nxh2 >> 10 14.06 0.60 1. ... Qe7 2. Kd1 Kd8 3. Nb5 Ng4 4. >> Ke1 Ke8 5. Nh4 Qf6 <HT> >> (4) 10-> 17.45 0.60 1. ... Qe7 2. Kd1 Kd8 3. Nb5 Ng4 4. >> Ke1 Ke8 5. Nh4 Qf6 <HT> >> (3) 11 43.06 0.77 1. ... Qe7 2. Nh4 g6 3. d3 h6 4. Be3 >> Ng4 5. Nd5 Qe6 6. Nb6 <HT> >> (2) 11 59.79 0.70 1. ... Qb6 2. d3 Qb4 3. Qxb4 cxb4 4. >> Nb5 Bb8 5. c5 e4 6. dxe4 Nxe4 7. Be3 >> d5 8. cxd6 Bxd6 9. Nxd6+ Nxd6 >> time=1:00 cpu=398% mat=0 n=66127556 fh=89% nps=1101k >> ext-> chk=1141865 cap=299906 pp=14274 1rep=43053 mate=5394 >> predicted=0 nodes=66127556 evals=18755159 >> endgame tablebase-> probes done=0 successful=0 >> hashing-> trans/ref=15% pawn=94% used=99% >> SMP-> split=357 stop=50 data=6/32 cpu=3:59 elap=1:00 >> >>and >> >>null_min = 0 >>null_max = 2 >> >>White(1): setboard r1bqk2r/pp1p1ppp/2nb1n2/2p1p3/Q1P5/2N2NP1/PP1PPPBP/R1B1K2R b >>KQkq - >>Black(1): go >> clearing hash tables >> time surplus 0.00 time limit 1:00 (1:00) >> nss depth time score variation (1) >>starting thread 1 >> 6 0.13 0.17 1. ... O-O 2. d3 Be7 3. Be3 d5 4. O-O-O >> 6-> 0.24 0.17 1. ... O-O 2. d3 Be7 3. Be3 d5 4. O-O-O >> 7 0.44 0.04 1. ... O-O 2. d3 Be7 3. Bg5 Ng4 4. >> Bxe7 Qxe7 5. Qd1 >> 7-> 0.79 0.04 1. ... O-O 2. d3 Be7 3. Bg5 Ng4 4. >> Bxe7 Qxe7 5. Qd1 >> 8 1.43 0.27 1. ... O-O 2. d3 Bc7 3. e4 Nb4 4. Qd1 >> d6 5. O-O >> 8-> 3.97 0.27 1. ... O-O 2. d3 Bc7 3. e4 Nb4 4. Qd1 >> d6 5. O-O >> 9 8.13 0.18 1. ... O-O 2. d3 Be7 3. Bd2 d6 4. O-O-O >> Ng4 5. Ne4 Bf5 >> 9-> 12.99 0.18 1. ... O-O 2. d3 Be7 3. Bd2 d6 4. O-O-O >> Ng4 5. Ne4 Bf5 >> 10 20.08 0.31 1. ... O-O 2. d3 Be7 3. Bd2 d5 4. cxd5 >> Nxd5 5. Nxe5 Nxe5 6. Nxd5 Re8 7. Nxe7+ >> Qxe7 >> 10-> 52.21 0.31 1. ... O-O 2. d3 Be7 3. Bd2 d5 4. cxd5 >> Nxd5 5. Nxe5 Nxe5 6. Nxd5 Re8 7. Nxe7+ >> Qxe7 >> time=1:00 cpu=398% mat=0 n=70974629 fh=97% nps=1180k >> ext-> chk=1444529 cap=863640 pp=142696 1rep=109480 mate=0 >> predicted=0 nodes=70974629 evals=14890017 >> endgame tablebase-> probes done=0 successful=0 >> hashing-> trans/ref=17% pawn=96% used=99% >> SMP-> split=124 stop=15 data=5/32 cpu=3:59 elap=1:00 >> >> >> >>From the 1rep to the mate extenstions, it went a _complete_ different route >>here. >> >>I guess my question is, what causes such a huge difference? > > >I realize that your's was a serious question. But I couldn't help but smile at >the notion that Bob is surrounded by a bunch of "Crafty Experts." I find that >hillarious! :) > >Bob D. However, it is reasonable to use that term. Several have done lots of experimental work using Crafty as the "host". IE GCP implemented Hsu's exact implementation of singular extensions into Crafty's search...
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